. >>> the head of the environmental protection agency, lisa jackson, has announced she is stepping down. the move ends a four-year tenure marked by high-profile fights with business groups and republicans. >>> and facebook's privacy settings, even tripping up cofounder, mark zuckerberg's family. you think they could figure this out. his sister posted a picture to a personal profile. she thought she clicked on meant for friends only. it ended up being tweeted by a marketing director some 40,000 followers. so from facebook to twitter in a push of a button. jon: take that. nationwide study giving parents something it celebrate other than the fact that their kids are on holiday break right now. this as "the new york times" reports that the battle against childhood obesity may finally be working. obesity rates are declining in parts of the u.s. where this system seemed toughest to resolve. dr. marti mccarry, physician of professor of public health at johns hopkins. what is the headline here, doctor? >> we may start to see the ceiling of child obesity rates. for a long time many of us have be